Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,...
Patent
1994-12-21
1996-09-03
Edwards, N.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
428364, 428394, 568303, D02G 300
Patent
active
055522181
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a yarn of a linear polymer of alternating ethylene and carbon monoxide units of which the maximum tangential modulus at an elongation of more than 0.2% is at least 10N/tex, and a process for making such yarns.
BACKGROUND OF THE INVENTION
Single filament yarns of this type are disclosed in International Patent Application WO 90/14453. The maximum modulus of the polyketone yarns described in said document generally is satisfactory. Also, some yarns of satisfactory tenacity are described. However, the elongation at break of yarns which possess such satisfactory tenacity is low, as a result of which the yarns are not always suitable for application in industry. The yarns described in this application which do have sufficient elongation at break are substantially less strong, so that, generally speaking, it can be argued that the overall quality of the yarns according to this document is found insufficient for every practical application.
Yarns of the type mentioned in the opening paragraph are also disclosed in EP-A-456 306. In this document, a yarn of good overall quality is described. However, the yarn is obtained by spinning through 6 capillaries, which means that the yarn is comprised of 6 filaments spun simultaneously. Such a slender yarn is not suitable for industrial practice.
SUMMARY OF THE INVENTION
In the present document, with a yarn both single filament yarns and multifilament yarns are meant. Polyketone yarns have now been found which exhibit very favourable properties in both of these respects, i.e., yarns of good tenacity also have the desired comparatively high elongation at break. The yarns of the very favourable quality now found can be prepared in a highly economical manner, viz. by spinning more than 30 filaments simultaneously through one spinneret. It is well-known that by spinning a yarn through a capillary comprising more than a few spinning holes, say 30 holes or more, the physical properties of the yarn will be considerably less than the yarn obtained by spinning through one or just a few spinning holes, especially when spinning at practical conditions.
The invention now consists in that the quality number according to the formula .sigma...epsilon. of the yarn of the type mentioned in the opening paragraph is higher than 85 mN/tex and the yarn comprises at least 30 filaments which are spun simultaneously through one spinneret. In the formula .sigma...epsilon., .sigma. stands for the tenacity of the yarn measured on a single filament and is expressed in mN/tex, while .epsilon. stands for the elongation at break, which is expressed as the ratio of the length of one filament at break to that of one filament in the unloaded state, minus 1.
It is known that the tenacity of the end product may be augmented by drawing the spun yarns. Such a process, however, always shows a marked decrease of the elongation at break.
In the making of the yarns according to the present invention, increased tenacity resulting from drawing of the yarns will likewise be attended with a decrease of the elongation, though to a significantly less marked degree than was the case according to the prior art. At virtually any draw ratio, the yarns found proved to have a higher quality number than was the case for the hitherto known products. Notably yarns of which the quality number is higher than 90 mN/tex more particularly higher than 100 mN/tex, and which comprise at least 30 filaments spun simultaneously through one spinneret, have proved highly suitable for a wide range of industrial applications. Also yarns have been found which have a quality number higher than 110 mN/tex. Preferably, the yarns according to the invention have a quality number higher than 120 and 130 mN/tex, more preferably higher than 140 mN/tex. Such very good quality yarns were not obtained before, not even when the yarn was spun through a spinneret having one single capillary. Accordingly, also found are yarns with a maximum tangential modulus at an elongation of more than 0.2% of at least 10 N/tex, which may be
Cloos Peter J.
Lommerts Bert J.
Maat Hendrik T.
Van Der Werff Harm
Akzo Nobel N.V.
Edwards N.
Miraglia Loretta A.
Morris Louis A.
Noto Joseph M.
LandOfFree
Polyketone yarn and a method of manufacturing same does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polyketone yarn and a method of manufacturing same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyketone yarn and a method of manufacturing same will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1948688